Simple Question, UNREACHABLE vs DOWN

Pete Dewell pete at stuff-done.co.uk
Thu Sep 29 14:36:25 CEST 2005


I agree with the down definition, but I've always thought of unreachable 
as :

Unreachable is when the parent of a host is down. e.g. if host1 is down, 
then any hosts that have host1 as a parent will be marked as 
unreachable, since Nagios cannot connect to those hosts to check them.

Pete Dewell

Rob Moss wrote:
> Steven Coutts wrote:
> 
>> What is the difference between a host being unreachable and a host 
>> being down?
>>
>> Regards
> 
> 
> Someone correct me if i'm wrong but my understanding is:
> 
> Unreachable is the first single ping check when nagios is started up..
> 
> Down is a hard state, after checking X many times (usually 10, defined 
> in nagios.cfg) it's flagged as down.
> 
> Cheers
> rob.
> 
> 
> 
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-- 
Pete Dewell | Stuff Done
pete at stuff-done.co.uk


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